[issue21015] support SSL_CTX_set_ecdh_auto on newer OpenSSLs

[Donald Stufft]

Donald Stufft added the comment:

I know it doesn't segfault or raise an error if you do that, but I don't know if it:

1) Replaces the already called ECDH Curve
2) Adds to the already called ECDH Curve
3) Silently Does Nothing.

If it's 2 or 3 then your patch will make SSLContext().set_ecdh_curve() a no-op and take away users ability to set their own curve.

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<http://bugs.python.org/issue21015>
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